This book definitely should be made into a movie. What a pleasurable read. I enjoyed every minute of it and didn't want it to end. The author left it open for a sequel, so I hope he makes one.
A boy finds a wall of cupboards plastered up in his attic bedroom. The all seem to open up to other worlds, but they're too small to crawl through. Eventually, he's able to find a way to go to the other worlds some other way than through his dreams. Quite an adventure unfolds as he learns of his family's past and why the cupboards were plastered over in the first place.